Thermal Analysis of Cerium-Treated Chill-Cast Al-23 Si Alloy

Vijayan, Vijeesh; Prabhu, K. Narayan

doi:10.1007/s11665-018-3670-6

Cited by 5 publications

(5 citation statements)

References 20 publications

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“…Undercooling acts as an energy barrier for the nucleation of dendrites [29][30][31]. In the absence of any heterogeneous nucleation agent, dendrite nucleation occurs at higher degrees of undercooling, leading to the formation of a smaller number of grains and a coarse-grained structure.…”

Section: Cacca Of the Flux-treated Alloymentioning

confidence: 99%

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A comprehensive analysis of cooling curves, fluidity, inclusions, porosity, and microstructure of NaCl-KCl-NaF flux treated Al-12Si alloy

Vijayan,

Shetty,

B N

et al. 2023

Mater. Res. Express

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In this study, we investigated the effects of treating Al-12 wt% silicon alloy with an equimolar composition mixture of NaCl, KCl, and NaF on various aspects of the alloy’s properties. Key findings of the research indicate that the flux treatment had significant effects on the alloy. It led to increased nucleation temperatures and reduced undercooling, thereby facilitating nucleation sites and grain refinement. Additionally, the inclusion of flux reduced the entrapment of inclusions in the melt, which can potentially enhance the mechanical properties of the alloy. However, it also led to a larger and more widely distributed gas porosity in the solidified samples, as gas evolved from the flux trapped during solidification. Moreover, the flux treatment had noticeable impacts on the morphology of eutectic silicon particles, reducing their aspect ratio. These findings offer valuable insights into the potential benefits and challenges of sodium-based flux melt treatment in optimizing the quality of Al-12Si alloy castings, particularly in die-casting applications.

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Section: Cacca Of the Flux-treated Alloymentioning

confidence: 99%

“…However, the presence of heterogeneous nucleants in the melt decreases the energy required for nucleation by providing nucleation sites, thereby reducing undercooling. Consequently, the nucleation of a larger number of grains from a less undercooled melt results in a fine-grained structure [30].…”

Section: Cacca Of the Flux-treated Alloymentioning

confidence: 99%

A comprehensive analysis of cooling curves, fluidity, inclusions, porosity, and microstructure of NaCl-KCl-NaF flux treated Al-12Si alloy

Vijayan,

Shetty,

B N

et al. 2023

Mater. Res. Express

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“…Previous research has established that rare earth elements can refine primary Si and modify eutectic Si, thereby improving the mechanical properties [8][9][10][11][12]. However, the mechanisms by which rare earth elements affect the primary and eutectic Si morphologies remain undefined and may favor either nucleation or growth.…”

Section: Introductionmentioning

confidence: 99%

“…Among the various available rare earth elements, Ce is a good candidate for microalloying in Al-Si casting alloys because of its comparably low cost. Several studies have been performed to determine the effect of Ce addition on hypereutectic Al-Si alloys [10][11][12]. Li et al [10] reported that the addition of Ce can significantly refine primary Si and modify eutectic Si.…”

Section: Introductionmentioning

confidence: 99%

Primary Si refinement and eutectic Si modification in Al-20Si via P-Ce addition

Chokemorh

Pandee

Chankitmunkong

et al. 2022

Mater. Res. Express

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Enhancing the mechanical properties of hypereutectic Al-Si alloys by refining the primary and eutectic Si morphology is very challenging. In this study, the refinement mechanism of primary and eutectic Si morphologies via the simultaneous addition of P-Ce into the Al-20Si alloy was studied. Microstructural analysis revealed that the primary and eutectic Si morphologies were significantly refined, which increased the tensile strength. Furthermore, the addition of Ce, up to 0.6 wt%, can result in the formation of Ce-rich intermetallic phases, which may lead to a significantly increased tensile strength while retaining the ductility of the alloy. The ultimate tensile strength of the Al-20Si alloy increased from 96 to 175 MPa, and the elongation increased from 1.0% to 1.7% with the addition of P-Ce. Moreover, the wear resistance of the alloy improved. The added P and Ce did not react with each other to form an intermetallic compound; therefore, this method can simultaneously refine primary and eutectic Si.

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“…The micro-and nano-sized particles of various oxides, carbides, and nitrides viz., CNT, B 4 C, SiO 2 , Al 2 O 3 , TiB 2 , TiC, SiC, Si 3 N 4 , etc. are dispersed in Al and Al alloys to produce high performance yet low-density materials [4][5][6]. However, the processing of MMNCs is a greater challenge owing to the inherent large surface area of nanoparticles resulting in agglomeration [7].…”

Section: Introductionmentioning

confidence: 99%

Investigation on synergetic effect of non-contact ultrasonic casting and mushy state rolling on microstructure and hardness of Al–Si–Al2O3 nanocomposites

Kottana

Vishwanatha

Sengupta

et al. 2022

Int J Interact Des Manuf

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The present work elucidates a novel way of processing Al–Si–Al2O3 bulk nanocomposites. The novel approach includes synergetic effect of non-contact ultrasonication and mushy state rolling for achieving appreciable uniformity in the distribution of nanoparticles in the metal matrix. A systematic study on the distribution of particles, the resultant microstructure, and also the resultant hardness in the nanocomposite has been presented. It is shown that the current methodology has resulted in enhanced distribution of nanoparticles in the metal matrix as compared to the earlier versions in the field. The structure of the nanocomposites has been explained on the basis of cavitation phenomena and particle pushing during solidification. The work also includes simulation using the Fluent platform to estimate the time available before the initiation of solidification to carry out effective deagglomeration and distribution of nanoparticles in the liquid melt using ultrasonic cavitation. Although the non-contact ultrasonic casting has resulted in a nearly uniform deagglomeration of nanoparticle clusters, a small number of agglomerates were present at the grain boundaries. Hence, the as-cast nanocomposites were deformed in the mushy state condition. An attempt has been made to explore the feasibility of enhancing the distribution of nanoparticles in the Al–Si matrix through semisolid state rolling. The synergetic effect has resulted in enhancement of the hardness of the material by 37%.

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Thermal Analysis of Cerium-Treated Chill-Cast Al-23 Si Alloy

Cited by 5 publications

References 20 publications

A comprehensive analysis of cooling curves, fluidity, inclusions, porosity, and microstructure of NaCl-KCl-NaF flux treated Al-12Si alloy

A comprehensive analysis of cooling curves, fluidity, inclusions, porosity, and microstructure of NaCl-KCl-NaF flux treated Al-12Si alloy

Primary Si refinement and eutectic Si modification in Al-20Si via P-Ce addition

Investigation on synergetic effect of non-contact ultrasonic casting and mushy state rolling on microstructure and hardness of Al–Si–Al2O3 nanocomposites

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